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Health care

Of or pertaining to the prevention and treatment of illness, and the preservation of physical and mental well-being, through the services provided by medical professionals.

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Health care > Optometry

permanent engraving

Eyewear; Optometry

Permanent engraving for the reconstruction of all reference points and measuring points of progressive lenses.

perimeter

Eyewear; Optometry

Instrument to assess differential light sensitivity in the visual field by detection of the presence of test stimuli on a defined background.

magnifier

Eyewear; Optometry

Lens system designed to produce an enlarged image by relative distance magnification. It may be a simple single element or compound multiple element system.

magnification of photography

Eyewear; Optometry

Ratio of the size of the image on the photosensitive target to that of the fundus at the centre of the photographic field, assuming that the eye is emmetropic and that it has a ...

low vision telescope

Eyewear; Optometry

Telescopic optical system, Galilean or Keplerian that forms a magnified retinal image of an object.

lenticular portion

Eyewear; Optometry

That portion of a lenticular lens which has the prescribed power.

atoroidal surface

Eyewear; Optometry

Surface having mutually perpendicular principal meridians of unequal curvature, of which the cross-section in at least one principal meridian is not circular.